We have two types of driving: screw driving and chain driving. The products are CE certified with ISO 90001 quality system certificate. Features: 1) Run smooth and low noise 2) Soft-start/soft-stop, run with slow-quick-slow 3) Automatically quick release with emergency or when came into object 4) Driving with qualitymotor, lifting capacity is greater 5) Accurately adjusting the door by keystroke 6) Can be affixed infrared safeguard, double-protection 7) Clipper-built shape, mini-remote control 8) Distance or effective remote control, the number of code is more than three thousand and five hundred million